Which of the following is not a feature of cyclostomes?
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a
Circular mouth
b
Cycloid scales
c
Unpaired fins
d
Closed circulatory system
answer is B.
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Detailed Solution
Cyclostomes have a sucking and circular mouth without jaws. Their body is devoid of scales and paired fins. Cranium and vertebral column are cartilaginous. Circulation is of closed type.